Red Seal Machinist Practice Exam

The primary purpose of a CNC (Computer Numerical Control) machine is to automate machining processes using programmed instructions. CNC machines operate based on a set of codes, known as G-code, which dictate the movements of the machine's tools and the operation of its components. This automation allows for high precision, repeatability, and efficiency in manufacturing parts, significantly reducing the need for manual intervention during the machining process.

By using a CNC machine, manufacturers can produce complex shapes and designs with great accuracy and detail, leading to consistent quality and production speed. The ability to store multiple programs enhances flexibility, allowing for quick transitions between different tasks or part designs without the need for manual setup each time. Thus, the core function of a CNC machine lies in its capability to automate these machining processes, which is effectively captured in the correct answer.